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Garry's Mod is a game on Steam that is an open-Sandbox game that uses the same engine as Half Life 2.
Garry's Mod's gameplay is an open sandbox game, with controls and macanics very much like Half-Life 2's. The main difference is that, the suit doesn't run out of the power thing when using flashlights, swimming underwater and sprinting. The game also allows the player to chose from single player up to 128 players on a server. The game has Steam Workshop support, for players to download mods from the Steam Workshop.